Declaring a variable with const is similar to let when it comes to Block Scope. The x declared in the block, in this example, is not the same as the x declared outside the block:

Jul 8, 2025 · The const declaration declares block-scoped local variables. The value of a constant can't be changed through reassignment using the assignment operator, but if a constant is an object, its …

Jul 11, 2025 · The const keyword in JavaScript is a modern way to declare variables, introduced in (ES6). It is used to declare variables whose values need to remain constant throughout the lifetime of …

This tutorial shows you how to use the JavaScript const keyword to declare constants whose values are immutable.

Read this tutorial and learn useful information about declaring a constant by using the const keyword which creates a read-only reference to the value.

Apr 16, 2025 · Learn how to declare constants in JavaScript using the const keyword, with examples and explanations.

Sep 14, 2025 · Introduced in ES6 (ES2015), const is a keyword used to declare a block-scoped variable that cannot be reassigned. Let's break that definition down because every part of it is crucial.

Sep 4, 2025 · Master JavaScript const, avoid mutation bugs, and write cleaner code. Real examples, common mistakes, working solutions. I spent my first year as a developer wondering why my …

Jan 20, 2014 · There are two aspects to your questions: what are the technical aspects of using const instead of var and what are the human-related aspects of doing so. The technical difference is …

Oct 27, 2023 · The const keyword is used to declare a variable that can’t be changed after its declaration. This keyword is short for constant (which means “doesn’t change”), and it’s used in a …